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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3154d82b790b617b2b15ff8ed0d28f775b3a5e4d0b8076b86205068724f32050' 
  AND token = 'qZxKNlX0emtpWHNR1GWuasbNic2exLnsFv/45rtMBYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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