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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b408422f3484a28535cea2ce86ac505996b084c12ee268124b658b5bdaa32b49' 
  AND token = 'ildXBh+ypyLnAIEc/ZBGJIXPc09vn9th05RScVdmkFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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