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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7e6971baaeefa5bae2ae95cb2f38bd1cc18d5dd87777fbbc1eac147225cb623' 
  AND token = 'zVGw2b2gi8UH1HDt9c5l1sRskm3PKvzI0Ssn/dNrM2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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