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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a0dbc6e58af075903d1db77c62d4aaafe28232afc2693fa2f1e62a1c9cc4a89' 
  AND token = '/4EhQqeykp3Ane7kDcBQAOMT0P5eSnbqIvna8zt7jIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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