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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b91b51152c8e8fb16801a96f60b6e24e3930b7ce238b2616771505217ac4c41c' 
  AND token = '8eizPYLqi2XIi7eZmmxQop3VVA1F+NFnFac128uoTP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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