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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7e55f7e4f5e0bcf2b255dc091c5ed6ef2b5acc53551afe7d21573ae9e8351f2' 
  AND token = '7Px3kC/TtTXwslLtH6VTr3CyODulc6TM6lg7VH6HRnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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