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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07e1a257e86669f7bdb5db5a3bf1f69deae54a800cd7d94a0aff6d00ad8fdb4c' 
  AND token = 'dtFa60gy9CGPedNh8lKJcmU2E++b07AolLM3utilQTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}