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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4f97bc769fa0d930ea673bcf4029c03908cc02bae10a65d4dfd43f34b0240ba' 
  AND token = 'CqYVJIuc0J12qYtN0g+S5Ct/IllyS5bH+CKcoQ1Hi9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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