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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a15a30ca0ec025f637c5e3ca6d3c1d54320924c99d2a0cd7ce4096517f87ce08' 
  AND token = 'MKaDyNLO7t2sYfzFzT1sSOJPW/5fV6NvF2KTYYb9g4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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