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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8284a64cb72101fb1c7180ab1166835b6c21d8a8704a827e43e67b608239686b' 
  AND token = 'm41Vpf7mp3Q3dMT9SSsYqYt4Azi9kleDmEGqVFK4B8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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