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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74d6e27af3b39d0223791276ecf24570cdd866dd7238e37b9ef3e12c96959f0f' 
  AND token = 'jXh2c8C8Q9nkjCPjeVfl6b0jHWCf8lyswjHLLuQwXhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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