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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c5d0fc88a02e30e529ec18a37907f64602446dd51a47555d88f2538012a97d2' 
  AND token = 'BC0q39McIBN+UI4Owq8/untbYZKXTiZdr2+UIuDyDSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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