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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beb93b92531d163e76231e3de1f362ef88dca8a67ffb8b6fdbaee02a98a99550' 
  AND token = 'ZrQHBU0OT2lA/HEzT1m6rv10KXdF+JWtAiokZGzyr2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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