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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd70efd54e9c968fab8b9a544a9ca18f81b6150b51ed3e52285c4e36644066a71' 
  AND token = 'x9VgG0FK8Ii/2f3AVk4LqH79+A+U51nqx+gKq39ytOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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