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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc35c4c3e2c0aa0deea33fdc41127a1f5633da30f9f80be41021f07afb91df2a' 
  AND token = 'BOcMooGiP6+QpsqqP9XIcloMRjOnbmxjY2/UvLbTLr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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