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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86c60604fefc6d47ebedb1eebae27b7f3e19e01135c6758dba09788a123f0424' 
  AND token = 'fepG4wC/fr+KfLF+Hu6B56sz1dYSEphmTd3NnXguQ90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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