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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c56913c1c1c2afdcd18651df36bf49ae8b9efed1e21a1b96405e23c3ac4a1cf0' 
  AND token = 'zX3lsTE0ZcpeyKLlYB2GohX64PsgFy89+zId+T9P6mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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