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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a5df7631c39b99c89a8fd73c5d65a1d23f520f9e9230af8c8d8156ee29458b5' 
  AND token = 'SFWxARJ9MiAnEaFcFG2uzsB6DEhfdZDrivkjPCpeJeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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