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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db386d4bf103d2e32fe7c5d41449f5e6be33f44b40ecb553cd1d9cb712148db0' 
  AND token = 'm6fX+XmvjjdHK3rcdSJvXMohzgWRXfqC8We2xc4Mjuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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