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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8075f2c3d3f204472bf893ce5320b6f4815451f963a3e0a0995681700be5ab9d' 
  AND token = 'Wl2iBjl7812fjR+xADem/m4ViATzFoRHpK9/i8TGxig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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