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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f64cae02a223dac1ef109c10f22d92704c7d0dc70a5fb3a918eeef3a6b1bcd83' 
  AND token = 'ZiHW4ARaPQ/fg2+HZSL3gj9pHD8m0oB+Laf6tIMTZmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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