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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d00a88d6d8a051a45f8293fbaa2e0fbccb3d2237f7e6a56f311ffaaec5db5f3' 
  AND token = 'udL9BP58VyYoYvs+fzwJQ4FOP5orGJAGc2ERMP1hf1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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