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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '177066b24c3200f5cac090391165c2f84d63d2aab029abedcad2d4f8ff7427dc' 
  AND token = 'xp7pDKu4pZ3Eg5wrsCMcG40pOJPjXmp6F7doAWEazuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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