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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69bee8ac709017d065c19b2c253499d9bb6ec57cad339d9b2f0babbde8d48c52' 
  AND token = 'SZM7iAnsMr78ErMDHVQZlZ4oq/qZWdDBivrfEx0cRYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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