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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '784dc065044b86144e1708373adc4392306bc76359417d32dc98cc3cd2cafa44' 
  AND token = 'DUF2qlwiLiywkJZ8TraaV8Vg9eXb68Jb2A2zeom9HwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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