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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00fc2b61fcf169ac2fe6288639ce6b2889ce541295efc6a6b2af4aed27ef68cf' 
  AND token = 'WRbD1AFmW+yI+c7hWwcq9Rwyaw4Zgw9hLNa7GVkpPc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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