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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76d7f4e5f6031b9d3f3e70e289a3287a4cfbb720142c0ed453dda4ecca3f7894' 
  AND token = 'ecKRc3kPqOnEQ3vVnSU5d5/tqRivZMHU3szklqcFwMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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