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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16307d2b68d48c6dda4ec7dfd7d4ff2369ea4055778016ad29b7ae6bcc75164c' 
  AND token = 'ByjHjuYi9/eqnPZYbVQkXmDC45SOcY4hmxEm1UTou4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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