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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2855533d0288b78446ce60ddaa12520894f89e03e373f85bd84fd3de39306cb' 
  AND token = 'gwmc/2gYPynpZcpgsSn4PMtUc9pNOh91SwWnZDtXqiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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