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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4bd19d50e1c5f9764f3884cca3938b6ff5ff58b47621d465857eecc5e64122b' 
  AND token = '10s/jWSow+HpQ6UiUOqpxp9R86a4/2DIk1RgAEy567w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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