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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d34b26c41065f351ed090b2ca7ed7d48fbb138073810f88698e8dbae0e6c0c4' 
  AND token = 'zOE4Dj4x4gL3tMOv8RSDfYFk6l3ZHerl+sdQBIuKI+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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