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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8ad73f5144bb21ba1a362e9b25975ed1a3300b520fad4b45e09ab12cec6e479' 
  AND token = 'fzrW3ECL2F09GHN6s4U/lQjFNPfTpvqTbUTfMGK/FTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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