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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '886315c1f704f957948ee031a9081ea0dca0f7f275135707c3e3d1ba14318812' 
  AND token = 'TqQa5VBI4xuhF/csAPLPMbfs+9Z40VvZSjIGnsW29mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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