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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd9bc4019b4b8a0242751d2e6d9ec795991e1a72f48743098681e3f2be4a79c3' 
  AND token = 'TMZZ+guPSjB92DIWcnyGQKgIjEA1rN02yUML69jXC+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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