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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe5372dbe726f927534a25e5f41311d9345c46081cb00ff1827c8d7ad7d0736e' 
  AND token = 'tzDyuJlNK0vDgweTIwYNt3bDyVndFHtYUmpLmK8QO40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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