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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a68671c604eed3829b084c15762be38a7c05ee39a76021f1f70e8734c19df8e' 
  AND token = 'Oj58yU7iX24ONHweDbAS6HLcH/a5qKrrAFwCUoLsQJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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