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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c91ca2fc7140aecc6ca5005b268783a09dbff40094a290ddfbb1de3fe312919c' 
  AND token = 'Pdl0G/TMfdV+tVGz37hnzma/3FmOvcznPEacmZgyBXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00100

JSON explain

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