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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05b1653599021d0f50654ae8b94365c6a403b191e9a97b9bd4e6e321a6bbe4a0' 
  AND token = 'wArOB9vo4Abye+p+Wbic1WasxPWREAkIPe2r/fbm2fQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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