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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76dd6df9fe81886ebad66e450834ae0a593215eb9fb75ebb4481ab91d0c92e43' 
  AND token = 'TLDEfrvHFZRrbuYLraScwDz/k1YExVF1rVJigsGzyQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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