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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd1ff78b0a80793097365c4d72bd59c9af2699dc54802dae50c044aeff0a373' 
  AND token = 'J5NxuuZoDqN5qqN2qwq1A4nrITjVLtBLk75jBg/Cfk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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