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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '390c61e428ebde9c20c431f1f65a89da1d61beea10182243cdc49793a143a975' 
  AND token = 'IeRdQWPEJR3ajRSnp2sSu40vV8g17grVC8oQ6Suqwi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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