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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef4ee2b506261adc4a9809f1ced59f1b5f4232af2a4d781afb819591ec3398aa' 
  AND token = '0lWX6lDlxinG9xvHeavr3xQSmSPP2wyS74Sc58tBGBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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