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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cebcea794dd78b4fd98c23747f6eb5289192342f5c3fc0a0bce57c3dc1a28de' 
  AND token = 'ttBYIx4e+bXjWb0auX8RBA+Z2R8/EL3S7Sk3bW9yyIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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