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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e404d1f43293e4bdeea500c6c805188b75a689830f5133fbdd6ad1833196fd26' 
  AND token = '3wH0qeZXZaoz7Q79pIQbU8ei7hLZ8Cm4PvLjFWqLIEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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