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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6084c2a06fb1c14871b5875c1e595415ef04979fc9394afff924f198e20acd0e' 
  AND token = 'EdSgr4QXV7D4Vj2sIANzIXIOwUWdr1MTwM9L6aUStfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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