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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b734c3f0eb4e0eece155e97b738e6aa60e2356d96136b45481b32d0e6a41d111' 
  AND token = 'gsO/NsClJ+V1NK2rnwPDJrPKsH0yovq2aHNQME8J8d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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