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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ea15b710aabc191d2d2dbbb947391ddfa83316cb52c9120f3d2548e5c9b7167' 
  AND token = 'Il/dkeobXGKSzghZJnx9n7RJSB3jALExTQSY2C/nbtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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