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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ec03c1f634f47626dd5f0041d3eaa653206dec8d9a2e4878071890632cd9f6c' 
  AND token = 'ERxcIUHAwD13hTixMSo69h9uUE1sE+G5mICAwb/aTQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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