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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c036b1318a100ea7d7157b5c194bc21b4ed7b1aeed15e07ba7f181d3a0192f0a' 
  AND token = 'CsdeR4p68WcmDAi3uptl+LRehmGEBE45bINQa3qqFAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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