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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed5b4af84db0ab0103291b5e1ecccda814a2dd1bead39568e4ac1d85622e0350' 
  AND token = 'Xk72QRphetzxVoGOhp914bBHXv+n/aC3FaWgiBQX+64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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