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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '951e2ec264f8ba232b89ae88b20b1c706582908bab96968cd6a5c397c0680f57' 
  AND token = 'vj393iMNevqBZD3cP7A2oUli+r1Nh+Sc1egBIw5uZi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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