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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a9a29c9b10ad965ad7a935cee4d45fbc4a3ba327f8379e8f654c44c4420d665' 
  AND token = 'ahlDUFw8AtWyF+2CRuvhOdUNfAHC458LgXcj0Y58vmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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