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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '860ca7c17546d034637838dc823325423d026da2f003cc86a6348b82098f43aa' 
  AND token = 'DPs86qzZnbhx55CChuiZl1gllUKbMC0C/vROq+xpCgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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