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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abbbf542f0f4a690f46ec24affb03c0067156f823098636b74d3aabfd022ec63' 
  AND token = 'BYa+m7FU/wgTcGzr00MBxvwy2iZEF57wYM6cYqvvN6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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