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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b530ec126ac6e8275530833a6729b475daaa4d5f23698d8f23ef3265f6ad5514' 
  AND token = 'qz7OHbdcWHLLA5A2dzOAhx+NMZmscqB7Qvv+szD3e1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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