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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cd16a3bd06eb231ce98322b974c26fd1176cd4093f72453112a8db3cf417b0f' 
  AND token = '5g+i4vN7/wjR9HV9WUky9rHTQibLV22/hRZAx0Ra+Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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