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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7735cb27eb31a0f5be4e42d5f7b7f2fa6c0e3062cddba6a2f031c09f5360c574' 
  AND token = 'zO0U686Q4V7xR7R14B4XKK/sXkS9Na8Jt74PRa0lL2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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