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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9002ef1649237002440768b196b18607de94ffd519ff3daf47870d53e37382f' 
  AND token = 'J28ObjTH7tkmVS82vP5c8FJMilJqQ/dy4V5rptxJfhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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