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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6717945fe1d019ab5c213152fc27d3a7cc33ce4df64e8a6d57dc6eef1990cc61' 
  AND token = '9lYpF3jY91bAeou9n6RsbBuSGxjlgh9Sj3GkLWbcbQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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