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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84aed9efc54d4725dd904989c5ffb8de0570ff739b72339c742dfe55a225e3e4' 
  AND token = 'mXmTbt2UAKx5+snq+z9cQQRDP1rWk6dksFApbeaDcSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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