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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '955c7ae7fafaf9c875852e18605b92beca026806e399ea030cf9d068fc3f6888' 
  AND token = 'xU+dQOThHxepfhxUKGNtsRXI33D9ZQO7J2fwN3d1a2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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