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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36bf55fe3713480eb4ac09bd3368fd10a5e4510c06cfd12353e2c8e2e462f4a2' 
  AND token = 'wgeHMag+lqvSFY9WIETVDKavyhIZmDWya80Nsfmh9Bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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