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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1a05a9b70cea06b336a4998d21bc4a9152d804dc39fc0cb52f948e3f141dfe9' 
  AND token = '7a8duGdP/pMNwDgSeNw7hfevmc3F2dDLmPjaQue27Vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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